| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Materials in Energy Environments II
|
| Presentation Title |
Microstructure Evolution and Mechanical Behavior of an Additively Manufactured High Strength Austenitic Stainless Steel
|
| Author(s) |
Srinivas Aditya Mantri, Xuan Zhang, Wei-Ying Chen, Lin Gao |
| On-Site Speaker (Planned) |
Srinivas Aditya Mantri |
| Abstract Scope |
The fast-cooling rates present during additive manufacturing of metals results in materials with unique microstructures. The formation of cellular structure, formed during the cooling process, has been linked to superior mechanical behavior. These cell walls could also potentially act as nucleation sites for nano-size precipitates which would further enhance the mechanical behavior. Alloy NF-709 was therefore fabricated using a Laser Powder Bed Fusion (LPBF) machine to explore the same. The design criteria for developing the composition of NF 709 were to have a stable austenite devoid of the sigma and other intermetallic phases under long-term elevated-temperature service conditions, and creep-strengthened by carbonitride M(CN). Optimization of process parameters led to achieving >99% density in the as-printed blocks. Microstructural evolution of the as-printed blocks as well as the effect of different heat-treatments will be discussed. Finally, the role of the microstructure of room and elevated temperature mechanical behavior will also be presented. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Nuclear Materials |